17O(α,γ)21Ne and 17O(α,n)20Ne for the weak s process

被引：0

作者：

Best, A. ^{[1
]}

Goerres, J. ^{[1
]}

Beard, M. ^{[1
]}

Couder, M. ^{[1
]}

deBoer, R. ^{[1
]}

Falahat, S. ^{[1
,2
]}

Gueray, R. T. ^{[3
]}

Kontos, A. ^{[1
]}

Kratz, K-L ^{[2
]}

LeBlanc, P. J. ^{[1
]}

Li, Q. ^{[1
]}

O'Brien, S. ^{[1
]}

Oezkan, N. ^{[3
]}

Pignatari, M. ^{[4
]}

Sonnabend, K. ^{[5
]}

Talwar, R. ^{[1
]}

Tan, W. ^{[1
]}

Uberseder, E. ^{[1
]}

Wiescher, M. ^{[1
]}

机构：

[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[2] Kacaeli Univ, Dept Phys, D-55020 Mainz, Germany

[3] Kacaeli Univ, Dept Phys, TR-41380 Umuttepe, Turkey

[4] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[5] Goethe Univ Frankfurt, Inst Appl Phys, D-60325 Frankfurt, Germany

来源：

EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (IV): FROM NUCLEI TO STARS | 2012年 / 1498卷

基金：

美国国家科学基金会;

关键词：

Helium burning; neutron poison; s process; R matrix; PROCESS NUCLEOSYNTHESIS; NE-21;

D O I：

10.1063/1.4768509

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratio of the reaction rates of the competing channels O-17(alpha,gamma)Ne-21 and O-17(alpha,n)Ne-20 determines the efficiency of O-16 as a neutron poison in the s process in low metallicity rotating stars. It has a large impact on the element production, either producing elements to the mass range of A=90 in case of a significant poisoning effect or extending the mass range up to the region of A=150 if the gamma channel is of negligible strength. We present an improved study of the reaction O-17(alpha, n)Ne-20, including an independent measurement of the O-17(alpha, n(1))Ne-20 channel. A simultaneous R-Matrix fit to both the n(0) and the n(1) channels has been performed. New reaction rates, including recent data on the O-17(alpha,gamma)Ne-21 reaction, have been calculated and used as input for stellar network calculations and their impact on the s process in rotating massive stars is discussed.

引用

页码：309 / 313

页数：5

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